Table of Contents
Advertisement
Login Delay Time
(-p lo)
In case it takes a long time to log into the target device, a larger delay time can be set to the adapter port by
using this parameter.
If LPAR manager is installed and LPAR is used on it, this parameter cannot be changed in the guest OS.
Refer to HVM section in Hitachi Compute Blade User's Guide for details.
Max Transfer Size
(-p mt)
1. Windows
Performance decrescence may occur and disk log may be recorded in Windows event log in case that the
adapter driver handle IO commands those total transfer size reach the upper limit. For work around of this
issue, setting this parameter in more than 16MB maintains the performance of adapter. Please refer the
following equation about the upper limit of total transfer size per adapter port.
(the number of LU) × (the value Queue Depth parameter) × 1MB
Setting this parameter spends (this value) × 4KB system memory per adapter port. When virtual fibre
channel port of Hyper-V is assigned, this cost of memory spends per virtual fibre channel port.
(Example)The number of LU which connect to adapter port is 3, Queue Depth parameter is 32.
The driver may handle IO commands those total transfer size is 96MB, because of 3 × 32 × 1MB = 96MB.
Setting this parameter in 128MB avoids performance decrescence and logging disk log.
In case that total transfer size is more than 256MB by this equation, please set this value in 256MB.
It is not recommended that setting this parameter in less than 16MB of default value.
2. Linux
This parameter defines the maximum data length of a single request. The parameter is set to the optimum
value for a general purpose, so usually this parameter does not need to be changed.
Even if the value is increased and exceeding a certain level, the performance usually remains the same
level, although the memory used by the adapter is increased.
Link Down Time
(-p ld)
Time out value in seconds for the next link up after the driver detected a link down. The parameter is set to
the optimum value for a general purpose, so usually this parameter does not need to be changed.
Reset Delay Time
(-p rd)
This parameter specifies the time before processing the next SCSI command after a reset (Target Reset,
etc.) command succeeded. The parameter is set to the optimum value for a general purpose, so usually
this parameter does not need to be changed. In Windows 2012 or later, the driver ignores this parameter
and behaves as if it is set to 0 second.
Machine Check Retry Count
This parameter specifies maximum permissive number of hardware failures before the adapter port become
blocked. If 0 is set to this parameter, the driver does not block the adapter port by a hardware failure. The
parameter is set to the optimum value for a general purpose, so usually this parameter does not need to be
changed.
Preferred AL-PA Number
(-p pa) *Displayed as "Preferred AL-PA"
If AL (Arbitrated Loop) connection type is set on a FC path between Hitachi Fibre Channel Adapter and the
device attached to it, the driver uses this parameter as preferred ALPA (Arbitrated Loop Physical Address)
on loop initialization phase. The parameter is set to the optimum value for a general purpose, so usually this
parameter does not need to be changed.
Reset Timeout
(-p rt) [Linux only]
This parameter specifies the time out value in seconds of a Target Reset command.
The parameter is set to the optimum value for a general purpose, so usually this parameter does not need to
be changed.
Abort Timeout
(-p at) [Linux only]
This parameter specifies the time out value in seconds of an Abort Task Set command.
The parameter is set to the optimum value for a general purpose, so usually this parameter does not need to
be changed.
Abort Restrain
(-p ar) [Linux only]
Inhibit issuing Abort Task Set command. Usually, this parameter does not need to be changed.
(-p mc) *Displayed as "Machine Check"
154
Advertisement
Table of Contents
